function detectOS() {
  var sUserAgent = navigator.userAgent;

  var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");

  var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel");

  if (isMac) return "Mac";

  var isUnix = (navigator.platform == "X11") && !isWin && !isMac;

  if (isUnix) return "Unix";

  var isLinux = (String(navigator.platform).indexOf("Linux") > -1);

  var bIsAndroid = sUserAgent.toLowerCase().match(/android/i) == "android";

  if (isLinux) {
    if (bIsAndroid) return "Android";

    else return "Linux";

  }

  if (isWin) {
    var isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1;

    if (isWin2K) return "Win2000";

    var isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 ||

      sUserAgent.indexOf("Windows XP") > -1;

    if (isWinXP) return "WinXP";

    var isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;

    if (isWin2003) return "Win2003";

    var isWinVista = sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;

    if (isWinVista) return "WinVista";

    var isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;

    if (isWin7) return "Win7";

  }

  if (sUserAgent.indexOf("Windows NT 8") != -1) {
    return "win8";

  }

  if (sUserAgent.indexOf("Windows NT 10") != -1) {
    return "win10";

  }

  return "other";

}

